Process of separating thorium from the other metals of the rare earths



TEiGE-IE, GE EEELI'fi-LKCHTENBER CT,

3 THE CHEMICAL FOUNDATION, 113G. A

393191335555 32 SERARATINQ- THO'RIUM FROM THE OTHER METALS BE THE BABE EARTI'S.

Application. ma April v I, Drerecim, e Ger- 2. all/( L resident of Beriin-Lichtenmany, '1 re invented certain new ii Th ih'oveznei izs in Processes. of g 1 J "Ehorium from the other Motels Bore Earths, of which the ioiiowing 11s iHVQTQi iOH relates to e iiovei'process of. ihorium from the other lncilfiis o the rare earths by precipitating file same means of hydrofluoric acid or by Plea-ins "uoricis,

- tion of the metals of -the rare "earths is precipitateci by means of solo; e or by means of hycirofhioric acid,

eh moi of the rare earths will r'uoricis; if however prois carried out only with e siioeii the prcci ii fig agent, thorium 'aitete ll L, \vi 4 the other metals c t. iii precipitate oziiy in :nm ie preci itation "therefore p d out with quantity of the igent which corresponds pp content of thorium.

; composiiion which 18 confer further My to do with solutions me composition. then w most favorobie 'rlon and to carry on the hese conditions. n stiii purer thorium from posit which con'csiiis thorium in rather quantities, the deposit may he redisprecipitated in the some manner. This process can be repeated as oi icii as it appears desirable in the indivich uni case. Also the deposit which contains greet qimii tios of thorium-may further ed in another way. The sohitions of cho metals of the rare earths 1 cm which the process originates may be of a diiicrent kind. Most preferably "the chloride or the nitrates are em- QTSRL soiveci anew and Specificetion of Letters Totem.

1915 Serial 1%. 21,558.

pioyed because with these there exists the least icndency for: oi/ma on of doohie salts; It is however eiso possihie in use for instance the suiietcs" The braiisiormetion takes place in acid as Well as in nominal solo-- irons and both in cold and warm C(flldlijifin,

The most favorable Working condicions can be ascertained for each indivichiiii; case eccordmg to the given Soil 2 on.v

iii the following K desrre :0 give an err-em ple of carrying my invention into effect:

100 of a solution of ihe chiorids Whose content of thorium corresponds to kg. of thoric oxid, while the contents of the other earths amount i0 25 1133., are mixei with 1.7 of ihioriii of sodium which. is preferably dissolved. in the quem city of Water and which is slowly added whiie 133813 the mass in motion. The deposit contains about thiiiric fluorid 22116 50% fluoride of fiche other :5 While the ratio 1 ioric oi'd and If it is not desirable to quantitatively separate the thorium, by reducing the quenit '01": sodium fluorich the process may be cerrieci on in such manner the: as early as the first preclpiiotion. :ipproiimi atciy pure 1 thorium fhiorid Wiil be ootei-ned.

the other met-sis of i-he rare earths, Whichconsists in reacting upon 1 sohitioii of the iiieceis of the rare earths ii i. quantity of e sohihie fluorin compound szibs'tenti; 11y corresponding; to the quantity oi? thorium contained in the sohifiion.

2. A process for separating thorium from the other metals of Gzhe rare earths, which consists in precipitating 2, solution of the metals of the rare earths by means of fiuorid of sodium, the quantity of said fluorid being chosen to result mainly in the precipitation of thorium contained in seid sohicion.

3. A process for separating thorium from the-other metals of the rare earths, which consists iiigprecipiteting :1 solution of the metals of the rare earths by means of e solubie fluorincompoimd of proper quantity to result mainly in a, precipitation of the the other 1n the original. solution had been about 1 :10.

thorium in said solution, thereupon dissolving the precipitated product, and again precipitating the same for further removing the other metals of the rare earths.

4. A process for separating thorium from the other metals of the rare earths, which consists in precipitating a solution of the metals of the rare earths by means of a soluble fluorid, .the quantity of said fluorid being chosen to result mainly in a precipitation of the thorium in said solution, thereupon dissol ling the precipitated product, and again precipitating the same for further removing the other metals of the rare earths. I

5. A process for separating thorium from the other metals of the rare earths, which consists in precipitating a solution of the metals of the rare earths by means of fluorid of sodium, the quantity of said fluorid being chosen to result mainly in a precipitation of the thorium in said solution, thereupon dissolving the precipitated product, and again precipitating the same for further removing 

